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I'm with o2 and they dont. although they have been bought by sky (not sure if sky currently filter/block)

They most definitely do. Sky here, and I can't access thepiratebay.se or thepiratebay.is.

I'm on Sky and can confirm they block thepiratebay.se, I'm not sure about .is, I'll check once I'm home but over SSH it seems to fail.

I'm with o2 broadband and they do, http://thepiratebay.se/ gives "The page you're looking for has been blocked."

http://www.icukhosting.co.uk don't for ADSL services

Currently enta.net, however I can't really recommend them (beyond the fact that they don't filter). I'm intending to switch to Andrews & Arnold as soon as FTTC is rolled out in my street, which is supposed to be real soon now.